Stuart, On Monday, December 12, 2011 14:38:37 Vivian Meazza wrote: > IIRC clouds were moved into bin 10 to improve appearance vis-à-vis > particles. If we put clouds back into bin 9 and particles remain in 10 all > the cooling towers, chimney efflux, aircraft contrails, exhausts etc. are > drawn after the clouds i.e, in front. Rather looks as if we can have > realism or framerate but not both.
Hmm, If I change the renderbin to 9 and instantiate a non sorted one, I am still draw limited here. Also If I look at the application runtime profile I see functions dominating that happen during draw in the driver. There is no sorting function high in profiles. May be OpenGL drivers that draw faster are depth sorting limited. But being draw limited this is what I can see here. But, the question is how many cloud drawables do we have? The render Bin sorting bottleneck - if we run into this - is O(log(n)*n) with the n= number depth sorted drawables. Which means we need to have a huge amount of cloud drawables that this effect dominates. Ok, looking into the Cloud drawable implementation, I believe that your almost first response is probably the easiest. Just without point sprites, just improoving what is currently done: Try to put that multiple draws into a single draw using array objects. Make sure that you still get a 'fast drawable'. YOu can verify this by asking the geometry if osg::Geometry::areFastPathsUsed() returns true. That is mostly: do not use any index arrays. The only indices which may be worthwhile are the indexed primitives sets. Sorting inside the drawable is then done by either redoing the arrays or probably better by using an indexed primitive set and reordering the indices. Greetings Mathias ------------------------------------------------------------------------------ Cloud Computing - Latest Buzzword or a Glimpse of the Future? This paper surveys cloud computing today: What are the benefits? Why are businesses embracing it? What are its payoffs and pitfalls? http://www.accelacomm.com/jaw/sdnl/114/51425149/ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
